Sierra Fuel Filter Medium 21 Micron | Mercury & Yamaha OEM Replacement

Reliable filtration for powerful marine engines

When you depend on steady power on the water, a dependable fuel filter matters. The Sierra Fuel Filter Medium is designed to support engines that demand consistent fuel delivery, featuring a 21 micron rating to help capture smaller particulates while maintaining healthy flow.

In real-world boating, you may notice more stable fuel delivery during long runs or when towing gear, especially with ethanol-blended fuels that can introduce more water and particulates. The filter is capable of flowing up to 90 gallons per hour, helping feed even higher-demand motors without creating noticeable flow restrictions.

Key filtration and compatibility details

• Flow capacity up to 90 GPH to support higher-demand engines
• Filtration rating of 21 microns for refined particle capture
• Long form factor: 435 inches long (1105 mm) to fit a variety of installations
• Thread pitch 42690 ensures a proper seal and secure mounting
• Designed to work with ethanol-blended fuels commonly used in marine environments
• OEM replacement for Mercury Marine 35-802893Q and Yamaha ABB-FUELF-IL-TR

Why choose this Sierra filter

This unit aligns with OEM references while delivering practical, real-world filtration for boats and small commercial vessels. Expect straightforward installation, a dependable seal, and compatibility with standard mounting configurations. While results can vary with fuel quality and engine condition, the filter can be a meaningful part of a broader fuel-management approach.

What to expect in use

• Consistent fitment with common thread pitch and mounting layouts
• Clear OEM-replacement guidance for Mercury and Yamaha references
• Potential for smoother operation during extended voyages and steady trolling

Real-world use scenarios

On a mid-size fishing boat, weekend cruiser, or workboat, dependable filtration supports steady throttle response and fuel delivery. The 21 micron rating helps balance filtration with adequate flow, while ethanol-blend compatibility addresses common fuel types found at marine docks. This combination may contribute to more predictable engine behavior during long runs or when navigating varying water temperatures.